TOYOTA SUPRA 1995 Service Repair Manual

Check pattern select switch.
Check harness and connector between battery and pattern select switch,
pattern select switch and ECM (See page IN±30).
Replace pattern select switch.
Repair or replace harness or connector.
Check and replace ECM.
PatternResistance
MANU0  (continuity)

(open)NORM
Disconnect the pattern select switch connector.
Measure resistance between the terminals 3 and 4
of the pattern select switch connector when the se-
lect switch is set to MANU and NORM positions.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±107

O D Main Switch & O D OFF Indicator Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and comes on when it is pushed out.
In O/D main switch OFF position the O/D OFF indicator lights up, and the ECM prohibits shifting to over-
drive. The ECM also causes the O/D OFF indicator light to blink when a malfunction is detected. In this
case, connecting the terminals in the DLC2 or DLC1 can display the malfunction code.
(*) O/D Main Switch
Contacts go off with button pushed in.
Contacts go on with button pushed out. AT2±108
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Check operation of O/D main switch.
1. Turn ignition switch ON.
2. Check ªO/D OFFº indicator light when O/D but-
ton is pushed in to ON.
ªO/D OFFº indicator light goes off.
3. Check ªO/D OFFº indicator light when O/D
button is pushed again, to OFF.
ªO/D OFFº indicator light lights up.
If the ªO/D OFFº indicator light blinks when the O/D
button is pushed in to ON, a malfunction is occurring
in the system.
Check the diagnostic trouble code.
Check voltage between terminal OD2 of ECM connector and body ground.
Check harness and connector between O/D off indicator light and ECM (See
page IN±30).
Go to step
Repair or replaces harness or connector.
Check and replace ECM.
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
O/D Main SwitchVoltage
OFF
ON
Below 0.5 V
10 ~ 14 V
Check voltage between terminal OD2 of ECM and
body ground.
1. Connect the Check Harness A to the ECM
(See page EG±510).
2. Turn ignition switch ON.
INSPECTION PROCEDURE
O/D OFF indicator light does not light up.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±109

Check O/D main switch.
Replace O/D main switch.
Repair or replace harness or connector.
Check and replace ECM.
Check harness and connector between O/D off indicator light and ECM (See
page IN±30).
Check O/D main switch.
1. Disconnect O/D main switch connector.
2. Measure resistance between terminals 2 and
4 of O/D main switch connector.
O/D Main SwitchResistance
ON
OFF0  (continuity)

(open)
Replace O/D main switch.
Check and replace combination meter. (See
combination meter troubleshooting section on
page BE±41).
O/D OFF indicator light remains ON
O/D OFF indicator light blinks
Do diagnostic trouble code check (See page AT2±34).
AT2±110± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Check voltage between terminal OD1 of ECM connector and body ground.
Measure voltage between terminal OD1 of ECM
connector and body ground.
Voltage: 4 Ð 6 V
Connect the Check Harness A to the ECM
Turn ignition switch ON.
Proceed to next circuit inspection shown on ma-
trix chart (See page AT2±64).
O D Cancel Signal Circuit
CIRCUIT DESCRIPTION
While driving with cruise control activated, in order to minimize gear shifting and provide smooth up±hill
cruising, overdrive may be prohibited temporarily in some conditions.
The Cruise Control ECU sends O/D cut signals to the ECM as necessary and the ECM cancels overdrive
shifting until these signals are discontinued.
(For details see the cruise control section, page BE±162)
INSPECTION PROCEDURE
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±111

Check voltage between terminal OD of Cruise Control ECU harness side
connector and body ground.
1. Disconnect Cruise Control ECU connector.
2. Turn ignition switch ON.
Repair or replace harness or connector.
Measure voltage between terminal OD of Cruise
Control ECU harness side connector and body
ground.
Voltage: 4 Ð 6 V
Check and replace Cruise Control ECU.
Check and replace ECM.
Check harness and connector between Cruise Control ECU and ECM (See
page IN±30).
AT2±112± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

TE1 Terminal Circuit
CIRCUIT DESCRIPTION
ECM displays diagnostic trouble codes using the O/D OFF indicator light when terminals TE1 and E1 of
the DLC2 or DLC1 are connected.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±113

Check voltage between terminal TE1 and E1 of DLC2 or DLC1.
Repair or replace harness or connector.
Measure voltage between terminals TE1 and E1 of
DLC2 or DLC1.
Voltage: 4 Ð 6 V
Proceed to next circuit inspection shown on ma-
trix chart (See page AT2±64).
Check and replace ECM.
Check harness and connector between ECM and DLC2, DLC1 and body
ground (See page IN±30).
INSPECTION PROCEDURE
AT2±114± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

TT Terminal Circuit
CIRCUIT DESCRIPTION
Checks of ECM input and output signals related to the throttle position sensor, brakes, shift position and
other circuits can be performed by measuring the voltages at terminal TT of the DLC2
INSPECTION PROCEDURE
Repair or replace harness or connector.
Check and replace ECM.
Check harness and connector between ECM and DLC2, DLC1 and body
ground (See page IN±30).
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±115

SERVICE SPECIFICATIONS
SERVICE DATA
 





Line pressure (wheel locked) Engine idling
D position
R position
AT stall
D position
R position 
 
 
 
 
471±530 kPa 4.8±5.4 kgf/cm2 68±77 psi
686±785 kPa 7.0±8.0 kgf/cm
2 100±114 psi
1,334±1,470 kPa 13.6±15.0 kgf/cm
2 193±213 psi
1,697±2,030 kPa 17.3±20.7 kgf/cm
2 246±294 psi Engine stall revolution D and R position 2,600 +150 rpm 


Time lag N "D position
N "R positionposition 
 Less than 1.2 seconds
Less than 1.5 seconds
 


Engine idle speed
(In N position and air conditioner OFF) 
 650 +50 rpm
 


Drive plate runout Max.
Torque converter clutch runout Max. 
 
0.20 mm 0.0079 in.
0.1 mm 0.004 in.
SHIFT POINT
NORM Mode
Shift positionShifting pointVehicle speed km/h (mph) 
 
 
 
 
 
 
D
 
 
 
 
 
 
 
Throttle valve fully opened 1"2
2"3
3"O/D
O/D"3
3"2
2"1
Throttle valve fully closed 3"O/D
O/D"3
 
 
 
 
 
 
 
62±72 (39±45)
120±129 (75±80)
187±201 (116±125)
181±195 (112±121)
109±117 (68±73)
41±47 (25±29)
29±34 (18±25)
23±28 (14±17)
 
 
 2
 
 
 
Throttle valve fully opened 1"2
*3"2
2"1 
 
 
62±72 (39±45)
135±147 (84±91)
41±47 (25±29)
 L Throttle valve fully opened *2"1 60±66 (37±41)
MANU Mode
 Shift position Shifting point Vehicle speed km/h (mph)
 
 
 
 
 
D
 
 
 
 
 
Throttle valve fully opened 2"3
3"O/D
O/D"3
3"2
Throttle valve fully closed 3"O/D
O/D"3 
 
 
 
 
122±131 (76±81)
194±207 (121±129)
187±201 (116±125)
109±117 (68±73)
181±195 (112±121)
23±28 (14±17)
 2 Throttle valve fully opened *3"2 135±147 (84±91)
 L Throttle valve fully opened *2"1 60±66 (37±41)
* Shift points is the same when the throttle valve is closed as when the throttle valve is opened. AT2±116
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS